作者:Rok Brisar、Dirk Hollmann、Esteban Mejia
DOI:10.1002/ejoc.201700949
日期:2017.10.2
and green synthetic method for the preparation of N,N-disubstituted tetramethylpyrazinium radical cations was developed, which does not require any solvent or strong alkylating agents. The investigation by UV/Vis and electron paramagnetic resonance (EPR) spectroscopy proved the stability of the prepared radical cation. Moreover, it was shown for the first time that the prepared N,N-disubstituted tetramethylpyrazine
开发了一种不需要任何溶剂或强烷化剂的高效、绿色合成制备N,N-二取代四甲基吡嗪鎓自由基阳离子的方法。紫外/可见光和电子顺磁共振(EPR)光谱的研究证明了制备的自由基阳离子的稳定性。此外,首次表明制备的 N,N-二取代四甲基吡嗪可以作为一种强大的无金属催化剂,用于在无溶剂条件下将胺选择性氧化均偶联至相应的亚胺。此外,氧气甚至空气都可以用作有效的氧化试剂。